1211120211021 has 16 divisors (see below), whose sum is σ = 1845654860928. Its totient is φ = 692016811200.

The previous prime is 1211120210921. The next prime is 1211120211083. The reversal of 1211120211021 is 1201120211121.

It is a happy number.

It is not a de Polignac number, because 1211120211021 - 2²¹ = 1211118113869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211120211421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1874010 + ... + 2436011.

It is an arithmetic number, because the mean of its divisors is an integer number (115353428808).

Almost surely, 2^{1211120211021} is an apocalyptic number.

It is an amenable number.

1211120211021 is a deficient number, since it is larger than the sum of its proper divisors (634534649907).

1211120211021 is a wasteful number, since it uses less digits than its factorization.

1211120211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4323412.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211120211021 its reverse (1201120211121), we get a palindrome (2412240422142).

It can be divided in two parts, 1211120 and 211021, that added together give a triangular number (1422141 = T₁₆₈₆).

The spelling of 1211120211021 in words is "one trillion, two hundred eleven billion, one hundred twenty million, two hundred eleven thousand, twenty-one".